Junction-box.



P. J. WITTENBERG.

JUNCTION BOX.

APPLICATION FILED SEPT. 15. 19!].

1,M4,517. Patented June 29,1915.

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WNCTION -BOE a -are Specification of Letters Batent.

Patented r m eater-a.

' the followingis a specification.

This invention relates to junction boxes and more particularly to that type of junction boxes used in concrete buildings.

Ehe object of my invention is to provide a simple, strong and compact junction box,

the essential feature of which consists in making the bottom of the same detachable from the body portion from the exterior thereof;

In buildings constructed of concrete it is well known that the forms or molds into which the concrete is to be poured are first set up before any of the electric conduits are put in place, and it is also well known that the end of the conduits inside of the junction boxes must be provided with bushings and on the outside of the junction boxes with lock nuts. Heretofore in the old or common form of junction boxes made of a single piece it has been customary when connecting the pipes to the junction boxes disposed within the concrete molds, to lift up the junction boxes and work from underneath the same in applying the bushings on the interior of the boxes. When three or more pipes enter a single junction box it will be obvious that this is a dificult operation, especially if the lengths of the pipes or conduits leading to the junction boxes are short, since the short lengths of pipe will allow but very little lifting of \th boxes which have their openings or tops plac dewnward or againstfie bottom of the molds. In cities'where the cost o labor strliction of parts and devicesand in the novel combinations of parts and .devices herein shown, described and claimed.

In the drawing forming a part of this specification, Figure 1 representsa top plan view of my improved junction box. Fig. 2 is a section of the structure shown in Fig. 1 taken on the line 2-2 of Fig. 1. Fig. 3 isa similar section taken on the line 33 of Fig. l. of the structure shown in Fig. 1. Fig. 5 shows diagrammatically the use of the-junction box in connection with a concrete mold. the latter being shown in dotted'lines;

Fig. 4 is an inverted or'bottom plan In the drawing, the main orbo'dy por- 0 therearound, said openings 11 being prefe'rably of the well-known type in which the punchings are left within the recess so that the same may be easily knocked out, when desired, by a sharp heavy blow. The body portion 10 is provided with the usual and customary interior cover-attaching lugs 12 which may be integrally or otherwise formed in connection with the main or body portion, thes lugs l2 heingproridedwiththe usual threaded openings adapted to receive the cover attaching screws. I also preferably provide the body portion lO-With external lugs 13 preferably on diagonally disposed portions of the body, which lugs 13 may be integrally or otherwise formed with the body 10 and are flush with the top is exceedingly high the element of time ethereof and provided with holes 14 by which comes a very important item, and it is my object to reduce as much as possible, the time required in fitting the bushings to the ends of the conduits within the junction boxes when the same. are employed in connection with concrete buildings, and to this end I make the bottom of the junction box removable so that a worMan may obtain easy access to the interior of the junction box without the necessity of lifting the same up from the bottom of the mold and working at a disadvantage from underneath the box.

My invention consists in the novel conthe lBdyTfiay bejastened to the bottom of the mold or other member as desired.

The bottom 15 of the i'unctionboxis providedwith the usual in ct holes or recesses 11, similar to those used in the main or body portion, and this bottom 15 is detachabiy connected with the body 10 by any suitable construction, and that which I have shown consists of loose or freely interengaging portions on one side of the body and a screw retaining structure on the opposite side. The loose or freely interengaging members which it have shown consist of a slot 16 in the body portion 10 and a lip 17 on the offset or depending lug 18 formed preferably integrally with the bottom 15. The other connection between the main or body portion and the bottom consists of a screw 19 passing through a hole 20 in a lip 21 similar to the lug 18 on the bottom, said screw 19 being threaded into a threaded hole 22 in the main or body portion. The bottom 15 and the body portion 10 are each recessed and provided with interengaging projections as more clearly shown in the bottom plan view in Fig. 4, which interengaging portions comprise recesses 25 in the bottom 15 adapted to receive the projections 26 on the body portion 10 and projections 27 on the bottom fitting the recesses formed in the body between the projection 26 thereon. This construction forms an important feature of my device since the body and bottom each form a supporting structure for the other when the punchings are being knocked out and thus prevent any undue distortion of the'parts.

B y simply removing the bottom 15 by unloosening the screw 19 it is apparent that the workman may screw on the bushings 23 while the junction box is placed with its v open or top end downward against the bottom of the mold 21 and thataj this structure will therefore save a very appreciable amount of time in laying the conduit. 7

Many changes may be made in the form I of attaching means which will readily sug-' gest themselves to those skilled in the art, and all such changes are contemplated which fairly come within the scope of the appended claims.

I claim 1. A sheet metal outlet box for usein concrete buildings comprising, in combination: a body member open at its top and having a plurality of openings provided with partially punched plugs; a readily attachable and detachable bottom secured to the body memberflvhereby the interior of the outlet box is easily accessible from above when the box is in an inverted position on a concrete mold; and means adjacent the top or cover end of the box by which the box may be temporarily secured to the concrete mold in an inverted position, substantially as specified.

2. A sheet metal outlet box adapted for use in concrete buildings comprising, in combination: a body member open at the top and having its bottom edge provided with a plurality of spaced projections forming recesses thercbetween, the body member being free from side seams or joints; a detachable bottom having also a' plurality of spaced projections around its periphery forming recesses therebetween, the projections of the bottom engaging and fitting in the recesses between the projections on the body member, and the projections of the body'member engaging and fitting in the recesses between the projections on the bottom, whereby a strong, rigid union is formed between the bottom and the body'member adapted to prevent unseating of the bottom or distortion of the body member when either is struck a heavy blow; and means for detachably securing the bottom to the body member, substantially as specified.

RAUL J. WITTENBERG.

Witnesses:

PEARL ABRAMS, H. M. MUNDAY. 

